Still no update for Galaxy S4 i9505 through Kies or OTA

I recently bought an S4 i9505 (a big jump the S I9000) and realised straight away that there is no way to move apps to an external memory card. I have waited and waited but not one update has come through despite everyone else somehow receiving it. I have tried through OTA and Kies but it just says I have the latest software installed every time I check. I would appreciate any help from anyone. I'm on 3 (sigh...) but my phone comes under BTU, and many people with BTU don't seem to have got the update either. 3 weren't any help at all and neither were Samsung when I contacted them for assistance.